Warp stop mechanism for looms



June 9, 1925.

H, A. DAVIS WAR? ST0? MEoHANx SM FOR LOOMS A TTORA/EY June 9, 1925 1 1,541,761

H. A. DAVIS Y WARP STOP MECHANISM FOR LOOMS Filed oct. 2. 1924 "s sheets-sheet s /7 TTORNEY Patented .lune 9, lllnff.

earner eerie-E.

HARRY A. DAVIS, HOPEIADALE, MASSACHUSETTS, ASSIGNOR DRAPER CORPORA- TIGN, OFHOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

weer s'ror rancrraursia ron Looms.

Applicationifled ctober2, 1924. Serial No. 741,152.

To all whom z' may concern.'

Be it known that I, HARRY A. Davis, a citizenof theA United States, and a resident of Hopedale, in the county ol l/Vorcester and State of Massachusetts, have invented an Improvement inWarp Stop ll/lechanisins 'tor Looms, oi which the following description,in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to warp stop `mechanisms for looms whereby `the y operative condition of the loom is changed when a warp thread breaks or becomes `too slack :tor weavingl purposes. i 1 f The accumulation of `lint `on themain parts of the warn stop niechanismxis a source of trouble in warp stop mechanisms and frequently becomes so serious that proper operation of the warpstop mechanism failsand the loom continues to run even when a warp thread breaks or becomes too slack 'for weaving purposes.

In that type of warp stop mechanism wherein the detector jis given -a reciprocating movement and is Aarrested in this movement by a drop wire .when a warp thread become-s almorn'ially conditioned,n` the nion'ientun'i. `ot movement ol the detector 'lirequently i euses injury to therdroji'i wires. This duc, among otherrauses,.to the rate of travel or speed ol' the detectorthe higher the speed ol' travel, the more liable will be injury to the-drop wire which arrests movement of the detector.

@neet the objects of. the present inven` tion'. therefore, is `to provide a warp stop mechanism of' simple and effective chaii'acter wherein the `parts arel so* arransred that lint may not* accumulate thereon vbut will 'e `shed or :tall from theparts of, the 'warp stop inchanisin withoulfinterfering lwith In the drawings: i Fig. l is a side elevation, partly in section, of a loom provided with the present invention g Fig. 2 is a sectional detail of means for knockinp` oil or stopping the loom by the backward movement of the lay; Fig 3 .is an enlarged detail and sectional view of portions of the stopping 1necha nisni; y i

Fig. l is an enlarged crosswsectional view ofthe main portions of the warp stop mechanism; i

5 is an elevation showing a portion the main `parts of the warp stop mechamsm, Y i i Fig. G is a perspective view ofthe main portions of the warp stop mechanism;

Fig. 7 is an enlarged det-ail showing the detector frame and the detectors secured thereto inedgewise vertical position; and

Fig. 8 is a sectional detail showing more particularly the detector frame and its guiding support.

The `loom frame l may be ot any usual construction and have associated therewith ameans ii''or stoppingthe loom when a warp thread breaks or beconies too slack for weaving` purposes.H In the present instance of the invention, as indicated in Fig. 1, thev shipper 2 is normally held in the shipper notch, as usual, during` weaving, and mount ed uponthe loom frame at 3 is a knock-off lever Lito which is connected at 5 a rod `6 entendiirfg,` rearwardly into an opening of a yoke 7 `which may be conveniently pivoted at 8 to a rocker arm 9 supported from the `loom frame at l0. In the opening 1l of J[he yoke Tis a dog l2 normally under the influence ol' a light spring 13 for maintainingthe dog in its inoperative position.

The lavlil is provided with a bunter which isI adapted to engage the dog l2 when the latter is'operatively positioned, the' coiiistruction being .such that lwhen. the dog` is engaged by the bunter l5, as the lay .moves back, the loom will be stopped. Extending"through the bracket member 1G, Fig. i2, .is the end 17 of a 'flexible wire 18 which is` enclosed "by a sheath 19, and the end 'of the part 17 rests against the dog 12, so that should the `wire 18 be moved longitudinally, the dog l2 will be placed in,op erative position to be struck by the bunter 115 as the lay moves back, and thereupon elifect looin stoppage; The other end portion ot the sheathed wire 18 is under the control of means connected to the warpy stop mechanism for effecting endwise nioveJA nient of the vwire in its sheath when the warp thread breaks or becomes too slacli for weaving purposes, as will inore'iully appear.

Adjustably mounted at the'side ot the looin traine is an arni 20, one of which is indicated-in Fig. G, and rising` troni the arin 2O is a stud 2l projecting into a socket 22 connected to one of the side brackets 23 of the inain portion ot' the warp stop inechanisn'i. The parts described are duplicated, one being at each side ot' the looin.

Mounted upon each o'f the side brackets is a top plate 2t havingl open bearings 25 tor the reception ot the drop wire guides 26 which extend between the twobrackets. Each of the drop wire guides 26 is provided with a washer 27 which is held pressed against the outside recessed portion 2T* ot the upstanding flange 28 by ineans ol a spring' Q9 interposed between the washer 27 and the nut 30. The details civ construe# tion are clearly shown in `Figs, 54 and 6.. At its opposite end the drop wirevguide 28 passes' through the openislot Q5 ot the flange, and on the youtside thereot is provided with a thuinb nut 31 threaded to the end ot the 'drop wire guide, the construction being such that by manipulation ot' the Vthuinb nut 3l the drop wire guide inay be tensioned under the` action of the spring` 29 and held yieldiiigily in position'. lLikewise7 by manipulation of .the thuiiib nut 3l, the drop wire guide n'iay be readily slackcncd and removed `trein the end supports for any purpose, such, 'for instance, as when a newset olt warp threads is to be einployed inthe looni.

The drop wireg'uidc 26 is thus supported lietween the side'brachctsrin the open bearings for ready removal ,along with the drop wires. ln the present instance, .the drop wires have the slots S?) through which the drop wire guide 26 passes`r and such drop vwire guides arepositiencd above the plane oi the *arp threads, as indicated in F il,

Obviouslya any niuiiiber of rows ot drop wires and drop wire guides niay ,be eniployed, but as shown in the present instance there are tour rows ot dropwires und drop wire guides, and the drop wires themselves are illustrated as ot' the hair pin type? a construction which lends to light ness in the weight of the drop wire.y although other l'ornis of drop wires inay be einployed.

Extending between the sidelbrackets 253 aie the guide bars 34 which-are relatively spaced a sulticient dist-ance apart for-the lower end portions 'of the drop wires to `freely inove therein, and the spaces between the pruidebars 34' are preferably such as to 'themselves In accordance with thepresent invention, the detector is given a detecting inovenieni'- below the drop-wires, as indicated in Fig. d,

and, as shown, is supported for reciprocating inoveinent'.- Incarrying' out this leaturc of the invention, the outside guide bars 3l have each secured thereto a bracket between which extends a guide 36.

Mounted upon the detector guide 36 is the detector traine, which comprises the side nienibers 37 extending downwardly about the. detector `guide B6, asindicated in Fifi 7 and 8, the downwardly extending portions S7 being otsiitticient extent to guide the detector vtraine upon the detector guide and to prevent the accumulation ot 'lintthereoir Thedownwardly extending;` portions 37 inay convenientlybe formed by bending the part connecting the two, as at 38, or the detector 'traine niay be otherwise constructed.

Within the housing thus leiined by the part 3S are the rollers 39 which rest upon the' deectorguide 36,l and attord anti-'triction means to facilitate the inoveineiit oiE the detector guide. In thev present instance ot the invention there is a detector guide at each'side ol the inain parts ot the vrai-p stop inech'anisinfbut any niiniber ot guides and detector tranies niay be eiiiployed in accordance with the-width ot the looin.

The detector iQ'iiideis connected by a link 40 with an operating' arin /l-l. as indicated iii 'Figi'. 1|. which is secured to the rock shaft 4t2, which inay itself bc conveniently supported in brackets el?) carried liv the inain vl'ranie ot' the warp stop ineclizinisin. sl'iowii in the presentiiistfinceqthc beni-ings fleet tor the rock shaitt l2 iniy be located one at each Vside oi" the warp stop nicchanisin, Frein the construction thiis't'ar described it will be apparent that upon rocking` niovcinent ot" the'roclcsha'rlt 4S the detector traine will'bc given its rcciprocatiiig;inovcincnt.

Secured totheroek shaft /l-Z is :i collar l-ylilig's. 3 and`5,'having a cani poi-tion #ttl w-hichengages a coniplemental cam portion lT- carried by avcollii-i 'd3 loosely mounted on the shaft 4Q; Between the collar lil and the collar i8 is a. spring4 5U which yiolding'ill; holds the coiiipliniental caii'is lli and t? engaged, as indicated in Fig. 3%. Extendingr troni the colla' ttl is the ai'ni 51 coinwctcil by the 'rod to rock shatt zictiiatiii;r ineens, the construction `beingsuch tlnitas lons); as the cains 46 and t7 are eiieafcrb as indicated in Fig. 3, and'no obstriiciionto the roc-kingfniovenient oli the shat't t2 is encountered, the rock shaft, and through the d-escribed'ineans the detector traine, will be given `operative inoveinent. Should however7 the detector frame be arrested, the-rock shaft 4t2 will be stopped,` whereup'on conf-"` ,tmuous actuation of the rod 52l wrl'ltturn the collar48 on the'now.J liXe-d shaft, and the collar 48 will 4be moved longitudinally onthe shaft against the tension otthe spring 5 0. `Advantage is taken of this movement to effect loom stoppage.

Rising from the hub portion'53of thearm l1 is a 4lug having a through-bearing 54,

Fig. 3, for the sheathed 4wire 18, the end of which bears against plunger which eX- tends in substantial parallelism with the shaft l2 into a socket 56,`Fig. 3, forn'ied in the collar 18, so that should the collar 48 be moved longitudinally of the shaft, as

hereinbetore described, it will effect move` `ment oi' the sheathed wire 18 and through the dog 12 effect loomstoppageon the backward movement of the lay.

The detector frame has connectedl there` with the detector. In the present instance,

the detector frame, one at each side of `the warp stopmechanism," carries tour detectors, each otwhich is arranged as a tlat` bar vertically disposed edgewise, so that any lint dropped on the detector or detectors will lind no"lodgeme nt" thereon, but will `drop away Ifrom the. warp stop mechanism.

In the present mstance,"the detector'trame hasa eut-awayportion at 57 affording shoul-` ders 58 at each 'side thereotfor'a detector." At the `endportions otthefdetector trame there are similarshouldei1 portions`59. Of

coursethenumber ol'wshoulders jonv the detector trame will dependfupon fthe number' oil deteclm's.` In the 1 n'esentinstance, each `detector isjlformed otna flatbar GO arranged eclgewise vertically, asshoivmand the upperI surface at` (il is preferably rounded ott to shed lint thatinayjdrop thereon.

. The `detectors may be vconnected to the 62 passes through the housings 13,8, and suitable nuts .63 serveto secure the detectors on the detector ,trame in anjedgewise Vvertical position, as described."

` Atall downwardlyontothe detectors, but inasinuch` as the "detectorsthemselves r,are termed andsecured as described, it will find.`

no lodgement and consequently not interfere with the proper operation oil the warp warp supports 6fl`iare held in bearings 65A whichare preferably formed of wood which maybe soaked inoil. The `bearings 65 are carried by brackets 6G which may be ady iustably held to the side frames 23 by means ef bolts G7 passing through Slots 68 in the Should any` lint 'drepflron') the `warp threads or other source `will pass through" the tree spacebetween the guide bars 34 and side trame. As the warp threads travel over tliefwarpsupportsfthe latter may roi wooden bearings.

In some instances 1t may be desirable to give additional' support to the warp sup` ports and "drop wire guides, and such additional means may consistof wooden bear` ings 69, Fi 6, betweenthe endsot theI warp supports and the interi'nediate bearings 70 for the drop wire guides. Such intermediate features, however, are not always necessary, but may be employed where the "width of the loom requires it;

`Owing to the'dt-)tecting movement oit the detector, as heretofore provided, the `drop Wires are 'frequently injured by the momen-V tum of the detector. '1 The present invention provides, however, that the `detector be given a slowdetecting movement, so` thatshould it Contact with a drop wire, the momentum" ot' the detector itselt will not injure the latter. In the present instance ot the invention, asindi# catedin Fig. 1, the actuating rod 52 eX- tends downwardly and is connectedwith a lever arm 71 p ivotally mounted at 72: and having a shoe 73 which bears upon the camv 74- under the impulse of the spring 7 5. i Secured orcomiected with the cam 74C is a goarJG which may be "driven "from the underor-cam shaft. The under or cam shaft 77 is drivenfrom the crankshaft 8 in a one to two ratio. That is to say, the under or cani shaft 77 makes one novelle tion`, .\vhile Vthe ci,jiiik"slia'lt `ina-lies two. Se cured vto 'the under or cam shaft 77 isa gear T9 and between the gear `Illaud the gear TG is a reduction gear 80 which in the present .in4 stance'males'one revolution to eachftu'o oi' thegear Tl); The relation ot the reduct1on` `gear 8O to thegear 76 is such that the latter makes onefrevolution to each two `,oft the gear 80. .Freni the construction de l, scribed as a present embodimentofthe invention, itlwill be apparent thaltthe gear 76,

and peritorce the'cam7-t which actuatesfthe preferably formed to `receive theV engaging face of the collar 27, and are shown as yrounded in order `to prevent accidental de# tachment of the drop wire guides due tto loom vibration vand yet permit ready re moval, as l'lereinljielfore explained.

The detector has a reciprocating movelil ment preferably ofgreater amplitude ythan the-.distance between theroivs of drop Wires or-'the .distance apart of the'boX plates 84,' and the top ofthe detector isso closely adjacent to the bottom of thebox lplates 34 which said1 guides .are housed to prevent accumulationofulint.onV the guides, a fla-t de-` tector mounted edgewisein a vertical plane. and having Aa rounded upper edgeand a series of drop wires normally supported by the Warp threads during weaving.

3. In a Warp stop mechanism, the combination of fixedguides, a. detector frame hav.- ing side members each provided With downwardly extending flanges' and. connecting top portions forminga housing for a xed gui-de, a ,detector extending between the side members, and `aseries of drop Wires normallysupported by the Warpv threads during Weaving.

4. Ina `Warp stop mechanism for looms,- the combination of a serieso'f drop Wires normally supported by the. Warp-threads during Weaving, fa. drop Wire guide yieldingly mounted at theside of the loom above the planeofthe Warp threads, guide bars at each .side of the drop Wires below the plane of the vWarp threads, aV d-rop Wire. detector frame having [iat drop Wire detector arranged edgeivise in a vertical plane:

' beloivthe drop Wires, means for reciprocating the detector frame horizontally, and means `for -stoppingthe loom when the detector frame isarrested in itsaeciprocating movement.

5. In a warp slop mechanism for looms, the combination of a series ot-di'op Wires, brackets at eachside of the loom ha-ving open slots,.a. drop vWirev guidefextendiug betiveen thebrackets, a; spring yat one end of the drop .wire 'guide exerting tension lengthwise. ofthe `drop AWireguide, and means 'for adjusting the tension of the spring.

6. In .a Warp stop mechanism for looms, the combination of a seri-es of 4drop lwires, bracketsat each side of tllieloom having open' slots,a drop wir@ guide extendingbetweenthe;b,rackets, a spring pressed fcollar bearing uponthe outside of thenbracket at oneend of the drop Wireguide exerting tension lengthwiseofthe drop -wire guide, and ymeans for adjusting-the ltension of the spring. f

7a. In ,a warp stop .1nechanism, the combination of .a seriesof drop wires, abracket ateach side ofv thefloom, a drop .vire .guide extending between. the brackets, a spring connected to-,the drop `Wireguide and exerting lengthysettension on. the vdrop wire guide and acting to 4retain the drop Wire guide in guiding position.

8. ,Ina warppstop ,mechanism foi-looms, the combinationor' a. series of drop wires, ahracketat each end of the row of drop Wires .ha-ving anfopen slot, al drop Wire guide extending between the brackets and resting in the open slots thereof, and a spring at oneend of. the,.drop Wireguide ontsidethc bracket exerting tension lengthwise of the dropy wire guide and permitting ready removal othedrop Wire guide.

9. In aY Warp stop. mechanism for looms, the combination otazseries ofdropf-Wires, a bracket ait each end of the Qrowof drop Wires having an. o-pen slot, a dropivire guide eX- tending between the brackets ,and resting in theopen slots'lthereof, `a,spri11g at one end ofthe drop.` Wire guidecoutsidethebracket exerting. tensionlengthwise- Vofv the drop wire guide and permittingready removal of the drop iviregnide, and amember interposed between thefspringfand bracket at yone end of the .drop `Wire guide.

10. Ina Warp stop mechanism .for looms, thecombinationof a seriesof drop Wires, a drop Wire guide, a, loom cam shaft, a detector cam,amgearonmthe,loom cam shaft, a. gear secured to thc detector cam, a bracket between thetivo gears having aslot for connection of different-.size change gears, and archange .gear for transmitting movement from the. camshaft. gear tothe detector, cam

gear.

V1l. In a Warp stop mechanism vfor looms, the combination or' a series of drop wires, a detector framehaving a seriesof flat det-ectors with top edges ,of less thicknessthan thebody ofthe. detector, means for securing the detectors ,edgewise iu vertical position,

onthe.detectorframe to shed lint, horizontal guides :for .supporting the detector frame, rollers housed from lintbet-ween-the guidesanch detector -frame, means for reciprocating the detector frame, and means itor stoppingthe loom whenv the detector .r'r-ame is arrested.

Inutestimonyf-whereof, I haycsigned my naine to this speci tica-tion.

y .HARRY A. `Dnvrs. 

